Please increase the MAX page size to above 14400 pixels (20")
Pdf can support page sizes up to miles long or wide.... (although this is slightly absurd, but yes, MILES long!) but if you create a large page in InDesign you are met with a lovely error message when you come to export. Larger page sizes would be beneficial for lots of reasons, app prototyping, print, really long articles and pictures of Giraffes ;-)
Seriously though, please oh wise Adobe can you increase this limitation to a more reasonable number, Thank-you.